Closed
Description
openedon Jan 6, 2022
Code
struct Test<T, const N: usize>([T; N]);
impl<T: Copy+Default, const N: usize> Default for Test<T, N> {
fn default() -> Self {
Self([T::default(); N])
}
}
impl<T, const N: usize> std::ops::Deref for Test<T, N> {
type Target = [T; N];
fn deref(&self) -> &[T; N] {
&self.0
}
}
impl<T, const N: usize> std::ops::DerefMut for Test<T, N> {
fn deref_mut(&mut self) -> &mut [T; N] {
&mut self.0
}
}
fn test() -> Test<u64, 16> {
let mut out = Test::default();
for val in out.iter_mut() {
*val = 0u64;
}
out
}Removing the const generic parameter N or annotating out inside test with an explicit type (e.g. let mut out: Test<u64, 16> = Test::default();) avoids the compiler panic.
Meta
Reproduces on stable, beta, and the nightly version available on the Playground. Backtrace and error output information are copied from Playground output.
Error output
Compiling playground v0.0.1 (/playground)
error[E0601]: `main` function not found in crate `playground`
--> src/main.rs:1:1
|
1 | / struct Test<T, const N: usize>([T; N]);
2 | |
3 | | impl<T: Copy+Default, const N: usize> Default for Test<T, N> {
4 | | fn default() -> Self {
... |
29 | | out
30 | | }
| |_^ consider adding a `main` function to `src/main.rs`
thread 'rustc' panicked at 'index out of bounds: the len is 13 but the index is 16', /cargo/registry/src/github.com-1ecc6299db9ec823/ena-0.14.0/src/snapshot_vec.rs:199:10
stack backtrace:
0: rust_begin_unwind
at /rustc/f1ce0e6a00593493a12e0e3662119786c761f375/library/std/src/panicking.rs:498:5
1: core::panicking::panic_fmt
at /rustc/f1ce0e6a00593493a12e0e3662119786c761f375/library/core/src/panicking.rs:107:14
2: core::panicking::panic_bounds_check
at /rustc/f1ce0e6a00593493a12e0e3662119786c761f375/library/core/src/panicking.rs:75:5
3: <rustc_infer::infer::equate::Equate as rustc_middle::ty::relate::TypeRelation>::relate::<&rustc_middle::ty::TyS>
4: rustc_middle::ty::relate::super_relate_tys::<rustc_infer::infer::equate::Equate>
5: <rustc_infer::infer::equate::Equate as rustc_middle::ty::relate::TypeRelation>::relate::<&rustc_middle::ty::TyS>
6: <rustc_infer::infer::sub::Sub as rustc_middle::ty::relate::TypeRelation>::relate_with_variance::<&rustc_middle::ty::TyS>
7: rustc_middle::ty::relate::super_relate_tys::<rustc_infer::infer::sub::Sub>
8: <rustc_infer::infer::sub::Sub as rustc_middle::ty::relate::TypeRelation>::tys
9: <rustc_infer::infer::at::At>::sup::<&rustc_middle::ty::TyS>
10: <rustc_typeck::check::method::confirm::ConfirmContext>::confirm
11: <rustc_typeck::check::fn_ctxt::FnCtxt>::lookup_method
12: <rustc_typeck::check::fn_ctxt::FnCtxt>::check_expr_kind
13: <rustc_typeck::check::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
14: <rustc_typeck::check::fn_ctxt::FnCtxt>::check_argument_types
15: <rustc_typeck::check::fn_ctxt::FnCtxt>::confirm_builtin_call
16: <rustc_typeck::check::fn_ctxt::FnCtxt>::check_call
17: <rustc_typeck::check::fn_ctxt::FnCtxt>::check_expr_kind
18: <rustc_typeck::check::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
19: <rustc_typeck::check::fn_ctxt::FnCtxt>::demand_scrutinee_type
20: <rustc_typeck::check::fn_ctxt::FnCtxt>::check_match
21: <rustc_typeck::check::fn_ctxt::FnCtxt>::check_expr_kind
22: <rustc_typeck::check::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
23: <rustc_typeck::check::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
24: <rustc_typeck::check::fn_ctxt::FnCtxt>::check_stmt
25: <rustc_typeck::check::fn_ctxt::FnCtxt>::check_block_with_expected
26: <rustc_typeck::check::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
27: rustc_typeck::check::check::check_fn
28: <rustc_infer::infer::InferCtxtBuilder>::enter::<&rustc_middle::ty::context::TypeckResults, <rustc_typeck::check::inherited::InheritedBuilder>::enter<rustc_typeck::check::typeck_with_fallback<rustc_typeck::check::typeck::{closure#0}>::{closure#1}, &rustc_middle::ty::context::TypeckResults>::{closure#0}>
29: rustc_typeck::check::typeck
30: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::plumbing::QueryCtxt, rustc_query_system::query::caches::DefaultCache<rustc_span::def_id::LocalDefId, &rustc_middle::ty::context::TypeckResults>>
31: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::typeck
32: <rustc_middle::hir::map::Map>::par_body_owners::<rustc_typeck::check::typeck_item_bodies::{closure#0}>
33: rustc_typeck::check::typeck_item_bodies
34: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::plumbing::QueryCtxt, rustc_query_system::query::caches::DefaultCache<(), ()>>
35: rustc_query_system::query::plumbing::get_query::<rustc_query_impl::queries::typeck_item_bodies, rustc_query_impl::plumbing::QueryCtxt>
36: <rustc_session::session::Session>::time::<(), rustc_typeck::check_crate::{closure#7}>
37: rustc_typeck::check_crate
38: rustc_interface::passes::analysis
39: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::plumbing::QueryCtxt, rustc_query_system::query::caches::DefaultCache<(), core::result::Result<(), rustc_errors::ErrorReported>>>
40: rustc_query_system::query::plumbing::get_query::<rustc_query_impl::queries::analysis, rustc_query_impl::plumbing::QueryCtxt>
41: <rustc_interface::interface::Compiler>::enter::<rustc_driver::run_compiler::{closure#1}::{closure#2}, core::result::Result<core::option::Option<rustc_interface::queries::Linker>, rustc_errors::ErrorReported>>
42: rustc_span::with_source_map::<core::result::Result<(), rustc_errors::ErrorReported>, rustc_interface::interface::create_compiler_and_run<core::result::Result<(), rustc_errors::ErrorReported>, rustc_driver::run_compiler::{closure#1}>::{closure#1}>
43: rustc_interface::interface::create_compiler_and_run::<core::result::Result<(), rustc_errors::ErrorReported>, rustc_driver::run_compiler::{closure#1}>
44: <scoped_tls::ScopedKey<rustc_span::SessionGlobals>>::set::<rustc_interface::util::setup_callbacks_and_run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_errors::ErrorReported>, rustc_driver::run_compiler::{closure#1}>::{closure#0}, core::result::Result<(), rustc_errors::ErrorReported>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_errors::ErrorReported>>
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
error: internal compiler error: unexpected panic
note: the compiler unexpectedly panicked. this is a bug.
note: we would appreciate a bug report: https://github.com/rust-lang/rust/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md
note: rustc 1.59.0-nightly (f1ce0e6a0 2022-01-05) running on x86_64-unknown-linux-gnu
note: compiler flags: -C embed-bitcode=no -C codegen-units=1 -C debuginfo=2 --crate-type bin
note: some of the compiler flags provided by cargo are hidden
query stack during panic:
#0 [typeck] type-checking `test`
#1 [typeck_item_bodies] type-checking all item bodies
#2 [analysis] running analysis passes on this crate
end of query stack
For more information about this error, try `rustc --explain E0601`.
error: could not compile `playground` due to previous error
Backtrace
thread 'rustc' panicked at 'index out of bounds: the len is 13 but the index is 16', /cargo/registry/src/github.com-1ecc6299db9ec823/ena-0.14.0/src/snapshot_vec.rs:199:10
stack backtrace:
0: rust_begin_unwind
at /rustc/f1ce0e6a00593493a12e0e3662119786c761f375/library/std/src/panicking.rs:498:5
1: core::panicking::panic_fmt
at /rustc/f1ce0e6a00593493a12e0e3662119786c761f375/library/core/src/panicking.rs:107:14
2: core::panicking::panic_bounds_check
at /rustc/f1ce0e6a00593493a12e0e3662119786c761f375/library/core/src/panicking.rs:75:5
3: <rustc_infer::infer::equate::Equate as rustc_middle::ty::relate::TypeRelation>::relate::<&rustc_middle::ty::TyS>
4: rustc_middle::ty::relate::super_relate_tys::<rustc_infer::infer::equate::Equate>
5: <rustc_infer::infer::equate::Equate as rustc_middle::ty::relate::TypeRelation>::relate::<&rustc_middle::ty::TyS>
6: <rustc_infer::infer::sub::Sub as rustc_middle::ty::relate::TypeRelation>::relate_with_variance::<&rustc_middle::ty::TyS>
7: rustc_middle::ty::relate::super_relate_tys::<rustc_infer::infer::sub::Sub>
8: <rustc_infer::infer::sub::Sub as rustc_middle::ty::relate::TypeRelation>::tys
9: <rustc_infer::infer::at::At>::sup::<&rustc_middle::ty::TyS>
10: <rustc_typeck::check::method::confirm::ConfirmContext>::confirm
11: <rustc_typeck::check::fn_ctxt::FnCtxt>::lookup_method
12: <rustc_typeck::check::fn_ctxt::FnCtxt>::check_expr_kind
13: <rustc_typeck::check::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
14: <rustc_typeck::check::fn_ctxt::FnCtxt>::check_argument_types
15: <rustc_typeck::check::fn_ctxt::FnCtxt>::confirm_builtin_call
16: <rustc_typeck::check::fn_ctxt::FnCtxt>::check_call
17: <rustc_typeck::check::fn_ctxt::FnCtxt>::check_expr_kind
18: <rustc_typeck::check::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
19: <rustc_typeck::check::fn_ctxt::FnCtxt>::demand_scrutinee_type
20: <rustc_typeck::check::fn_ctxt::FnCtxt>::check_match
21: <rustc_typeck::check::fn_ctxt::FnCtxt>::check_expr_kind
22: <rustc_typeck::check::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
23: <rustc_typeck::check::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
24: <rustc_typeck::check::fn_ctxt::FnCtxt>::check_stmt
25: <rustc_typeck::check::fn_ctxt::FnCtxt>::check_block_with_expected
26: <rustc_typeck::check::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
27: rustc_typeck::check::check::check_fn
28: <rustc_infer::infer::InferCtxtBuilder>::enter::<&rustc_middle::ty::context::TypeckResults, <rustc_typeck::check::inherited::InheritedBuilder>::enter<rustc_typeck::check::typeck_with_fallback<rustc_typeck::check::typeck::{closure#0}>::{closure#1}, &rustc_middle::ty::context::TypeckResults>::{closure#0}>
29: rustc_typeck::check::typeck
30: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::plumbing::QueryCtxt, rustc_query_system::query::caches::DefaultCache<rustc_span::def_id::LocalDefId, &rustc_middle::ty::context::TypeckResults>>
31: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::typeck
32: <rustc_middle::hir::map::Map>::par_body_owners::<rustc_typeck::check::typeck_item_bodies::{closure#0}>
33: rustc_typeck::check::typeck_item_bodies
34: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::plumbing::QueryCtxt, rustc_query_system::query::caches::DefaultCache<(), ()>>
35: rustc_query_system::query::plumbing::get_query::<rustc_query_impl::queries::typeck_item_bodies, rustc_query_impl::plumbing::QueryCtxt>
36: <rustc_session::session::Session>::time::<(), rustc_typeck::check_crate::{closure#7}>
37: rustc_typeck::check_crate
38: rustc_interface::passes::analysis
39: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::plumbing::QueryCtxt, rustc_query_system::query::caches::DefaultCache<(), core::result::Result<(), rustc_errors::ErrorReported>>>
40: rustc_query_system::query::plumbing::get_query::<rustc_query_impl::queries::analysis, rustc_query_impl::plumbing::QueryCtxt>
41: <rustc_interface::interface::Compiler>::enter::<rustc_driver::run_compiler::{closure#1}::{closure#2}, core::result::Result<core::option::Option<rustc_interface::queries::Linker>, rustc_errors::ErrorReported>>
42: rustc_span::with_source_map::<core::result::Result<(), rustc_errors::ErrorReported>, rustc_interface::interface::create_compiler_and_run<core::result::Result<(), rustc_errors::ErrorReported>, rustc_driver::run_compiler::{closure#1}>::{closure#1}>
43: rustc_interface::interface::create_compiler_and_run::<core::result::Result<(), rustc_errors::ErrorReported>, rustc_driver::run_compiler::{closure#1}>
44: <scoped_tls::ScopedKey<rustc_span::SessionGlobals>>::set::<rustc_interface::util::setup_callbacks_and_run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_errors::ErrorReported>, rustc_driver::run_compiler::{closure#1}>::{closure#0}, core::result::Result<(), rustc_errors::ErrorReported>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_errors::ErrorReported>>
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
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